Homewoek Week 1
Homework Week 1
MIS 589 Networking Concepts and Applications
September 6, 2014
Charles McComb
P3. Consider an application that transmits data at a steady rate (for example, the sender generates an N-bit unit of data every k time units, where k is small and fixed). Also, when such an application starts, it will continue running for a relatively long period of time. Answer the following questions, briefly justifying your answer: a. Would a packet-switched network or a circuit-switched network be more appropriate for this application? Circuit-switched network
Why? There is a long stream of data to be sent, therefore a In circuit-switched networks, the resources needed along a path (buffers, link transmission rate) to provide for communication between the end systems are reserved for the duration of the communication session between the end systems. (Text page 28)
b. Suppose that a packet-switched network is used and the only traffic in this network comes from such applications as described above. Furthermore, assume that the sum of the application data rates is less than the capacities of each and every link. Is some form of congestion control needed? No
Why? There is no congestion as the data is less than the capacities of each and every link. (Text page 28)
P4. Consider the circuit-switched network in Figure 1.13. Recall that there are 4 circuits on each link. Label the four switches A, B, C and D, going in the clockwise direction.
a. What is the maximum number of simultaneous connections that can be in progress at any one time in this network? 16. (Text page 28)
b. Suppose that all connections are between switches A and C. What is the maximum number of simultaneous connections that can be in progress? 4 (Text page 28)
c. Suppose we want to make four connections between switches A and C, and another four connections between switches B and D.
MIS 589 Networking Concepts and Applications
September 6, 2014
Charles McComb
P3. Consider an application that transmits data at a steady rate (for example, the sender generates an N-bit unit of data every k time units, where k is small and fixed). Also, when such an application starts, it will continue running for a relatively long period of time. Answer the following questions, briefly justifying your answer: a. Would a packet-switched network or a circuit-switched network be more appropriate for this application? Circuit-switched network
Why? There is a long stream of data to be sent, therefore a In circuit-switched networks, the resources needed along a path (buffers, link transmission rate) to provide for communication between the end systems are reserved for the duration of the communication session between the end systems. (Text page 28)
b. Suppose that a packet-switched network is used and the only traffic in this network comes from such applications as described above. Furthermore, assume that the sum of the application data rates is less than the capacities of each and every link. Is some form of congestion control needed? No
Why? There is no congestion as the data is less than the capacities of each and every link. (Text page 28)
P4. Consider the circuit-switched network in Figure 1.13. Recall that there are 4 circuits on each link. Label the four switches A, B, C and D, going in the clockwise direction.
a. What is the maximum number of simultaneous connections that can be in progress at any one time in this network? 16. (Text page 28)
b. Suppose that all connections are between switches A and C. What is the maximum number of simultaneous connections that can be in progress? 4 (Text page 28)
c. Suppose we want to make four connections between switches A and C, and another four connections between switches B and D.